/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------------------
* ClusteredXYBarRenderer.java
* ---------------------------
* (C) Copyright 2003, 2004, by Paolo Cova and Contributors.
*
* Original Author: Paolo Cova;
* Contributor(s): David Gilbert (for Object Refinery Limited);
* Christian W. Zuckschwerdt;
* Matthias Rose;
*
* $Id: ClusteredXYBarRenderer.java,v 1.1 2004/08/31 14:49:29 mungady Exp $
*
* Changes
* -------
* 24-Jan-2003 : Version 1, contributed by Paolo Cova (DG);
* 25-Mar-2003 : Implemented Serializable (DG);
* 01-May-2003 : Modified drawItem(...) method signature (DG);
* 30-Jul-2003 : Modified entity constructor (CZ);
* 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
* 07-Oct-2003 : Added renderer state (DG);
* 03-Nov-2003 : In draw method added state parameter and y==null value handling (MR);
* 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with getYValue() (DG);
*
*/
package org.jfree.chart.renderer.xy;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
/**
* An extension of {@link XYBarRenderer} that displays bars for different
* series values at the same x next to each other. The assumption here is
* that for each x (time or else) there is a y value for each series. If
* this is not the case, there will be spaces between bars for a given x.
* <P>
* This renderer does not include code to calculate the crosshair point for the plot.
*
* @author Paolo Cova
*/
public class ClusteredXYBarRenderer extends XYBarRenderer implements Cloneable,
PublicCloneable,
Serializable {
/** Percentage margin (to reduce the width of bars). */
private double margin;
/** A data value of zero translated to a Java2D value. */
private double translatedRangeZero;
/** Determines whether bar center should be interval start. */
private boolean centerBarAtStartValue;
/**
* Default constructor. Bar margin is set to 0.0.
*/
public ClusteredXYBarRenderer() {
this(0.0, false);
}
/**
* Constructs a new XY clustered bar renderer.
*
* @param margin the percentage amount to trim from the width of each bar.
* @param centerBarAtStartValue If true, bars will be centered on the start of the time period.
*/
public ClusteredXYBarRenderer(double margin, boolean centerBarAtStartValue) {
super(margin);
this.margin = margin;
this.centerBarAtStartValue = centerBarAtStartValue;
}
/**
* Initialises the renderer. Here we calculate the Java2D y-coordinate for zero, since all
* the bars have their bases fixed at zero. Copied from superclass to
* initialize local variables.
*
* @param g2 the graphics device.
* @param dataArea the area inside the axes.
* @param plot the plot.
* @param data the data.
* @param info an optional info collection object to return data back to the caller.
*
* @return The number of passes required by the renderer.
*/
public XYItemRendererState initialise(Graphics2D g2,
Rectangle2D dataArea,
XYPlot plot,
XYDataset data,
PlotRenderingInfo info) {
XYItemRendererState state = super.initialise(g2, dataArea, plot, data, info);
ValueAxis rangeAxis = plot.getRangeAxis();
this.translatedRangeZero = rangeAxis.valueToJava2D(0.0, dataArea, plot.getRangeAxisEdge());
return state;
}
/**
* Sets the margin.
*
* @param margin the margin.
*/
public void setMargin(double margin) {
this.margin = margin;
super.setMargin(margin);
}
/**
* Draws the visual representation of a single data item. This method
* is mostly copied from the superclass, the change is that in the
* calculated space for a singe bar we draw bars for each series next to
* each other. The width of each bar is the available width divided by
* the number of series. Bars for each series are drawn in order left to
* right.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the area within which the plot is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color information etc).
* @param domainAxis the domain axis.
* @param rangeAxis the range axis.
* @param dataset the dataset.
* @param series the series index.
* @param item the item index.
* @param crosshairState crosshair information for the plot (<code>null</code> permitted).
* @param pass the pass index.
*/
public void drawItem(Graphics2D g2,
XYItemRendererState state,
Rectangle2D dataArea,
PlotRenderingInfo info,
XYPlot plot,
ValueAxis domainAxis,
ValueAxis rangeAxis,
XYDataset dataset, int series, int item,
CrosshairState crosshairState,
int pass) {
IntervalXYDataset intervalData = (IntervalXYDataset) dataset;
Paint seriesPaint = getItemPaint(series, item);
Paint seriesOutlinePaint = getItemOutlinePaint(series, item);
Number y = intervalData.getY(series, item);
if (y == null) {
return;
}
RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
double translatedY = rangeAxis.valueToJava2D(y.doubleValue(), dataArea, yAxisLocation);
RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
double x1 = intervalData.getStartXValue(series, item);
double translatedX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
double x2 = intervalData.getEndXValue(series, item);
double translatedX2 = domainAxis.valueToJava2D(x2, dataArea, xAxisLocation);
double translatedWidth = Math.max(1, Math.abs(translatedX2 - translatedX1));
double translatedHeight = Math.abs(translatedY - this.translatedRangeZero);
if (this.centerBarAtStartValue) {
translatedX1 -= translatedWidth / 2;
}
if (this.margin > 0.0) {
double cut = translatedWidth * this.margin;
translatedWidth = translatedWidth - cut;
translatedX1 = translatedX1 + cut / 2;
}
int numSeries = dataset.getSeriesCount();
double seriesBarWidth = translatedWidth / numSeries;
Rectangle2D bar = null;
PlotOrientation orientation = plot.getOrientation();
if (orientation == PlotOrientation.HORIZONTAL) {
bar = new Rectangle2D.Double(Math.min(this.translatedRangeZero, translatedY),
translatedX1 - seriesBarWidth * (numSeries - series),
translatedHeight, seriesBarWidth);
}
else if (orientation == PlotOrientation.VERTICAL) {
bar = new Rectangle2D.Double(translatedX1 + seriesBarWidth * series,
Math.min(this.translatedRangeZero, translatedY),
seriesBarWidth, translatedHeight);
}
g2.setPaint(seriesPaint);
g2.fill(bar);
if (Math.abs(translatedX2 - translatedX1) > 3) {
g2.setStroke(getItemStroke(series, item));
g2.setPaint(seriesOutlinePaint);
g2.draw(bar);
}
// add an entity for the item...
if (info != null) {
EntityCollection entities = info.getOwner().getEntityCollection();
if (entities != null) {
String tip = null;
XYToolTipGenerator generator = getToolTipGenerator(series, item);
if (generator != null) {
tip = generator.generateToolTip(dataset, series, item);
}
String url = null;
if (getURLGenerator() != null) {
url = getURLGenerator().generateURL(dataset, series, item);
}
XYItemEntity entity = new XYItemEntity(bar, dataset, series, item, tip, url);
entities.addEntity(entity);
}
}
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer cannot be cloned.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}